vec_utils.cpp~

数据挖掘经典的hierarchial clustering algorithm

#include <iostream.h>
#include <fstream.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>

//#include "Set.h"
//#include "utils.h"
//#include "globals.h"
//#include "sample.h"

const int VEC_BLOCK_SIZE=10240;

static int dimensionality;
#ifdef ASCII
ifstream ifile;
#else
static int fd;
//static ifstream ifile;
static int curOffset;
static char *tmpBuf;
static int bytesRead;
#endif


void 
SetupVectorScan(char *fileName, char *buffer, int dimn)
{
  fd = open(fileName, O_RDONLY);
  assert(fd != -1);

  assert(dimn > 0);
  dimensionality = dimn;
  curOffset = 0;
  bytesRead = 0;
  tmpBuf = buffer + VEC_BLOCK_SIZE;
}

int
getNextVector(Vector& vec, char *buffer)
{
  if ((tmpBuf - buffer) >= bytesRead)
    {
      bytesRead = getNextBlock(

}